If you had 10k to spend on tube amp?????

For what speakers? Amps and speakers should always be considered in combination with one another. Nonetheless, my short list would include:

Atma-Sphere OTLs (the MA-2s will drive most speakers but a used pair will be over your limit, the MA-1s require a bit more care in matching)

Convergent Audio/CAT (if one must live with a transformer based amp)

Lamm (for efficient speakers)
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Yes at first. When I upgrade it will be Vandersteen 5A's.

Get the Rogue Zeus for $7995 new or for much less used.They don't show up used very often though.Keep the other $2000 for your speakers upgrade .
Best
George